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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <linux/bitops.h>
#include "spectrum.h"
#include "core.h"
#include "reg.h"
#include "resources.h"
struct mlxsw_sp2_kvdl_part_info {
u8 res_type;
/* For each defined partititon we need to know how many
* usage bits we need and how many indexes there are
* represented by a single bit. This could be got from FW
* querying appropriate resources. So have the resource
* ids for for this purpose in partition definition.
*/
enum mlxsw_res_id usage_bit_count_res_id;
enum mlxsw_res_id index_range_res_id;
};
#define MLXSW_SP2_KVDL_PART_INFO(_entry_type, _res_type, \
_usage_bit_count_res_id, _index_range_res_id) \
[MLXSW_SP_KVDL_ENTRY_TYPE_##_entry_type] = { \
.res_type = _res_type, \
.usage_bit_count_res_id = MLXSW_RES_ID_##_usage_bit_count_res_id, \
.index_range_res_id = MLXSW_RES_ID_##_index_range_res_id, \
}
static const struct mlxsw_sp2_kvdl_part_info mlxsw_sp2_kvdl_parts_info[] = {
MLXSW_SP2_KVDL_PART_INFO(ADJ, 0x21, KVD_SIZE, MAX_KVD_LINEAR_RANGE),
MLXSW_SP2_KVDL_PART_INFO(ACTSET, 0x23, MAX_KVD_ACTION_SETS,
MAX_KVD_ACTION_SETS),
MLXSW_SP2_KVDL_PART_INFO(PBS, 0x24, KVD_SIZE, KVD_SIZE),
MLXSW_SP2_KVDL_PART_INFO(MCRIGR, 0x26, KVD_SIZE, KVD_SIZE),
MLXSW_SP2_KVDL_PART_INFO(TNUMT, 0x29, KVD_SIZE, KVD_SIZE),
};
#define MLXSW_SP2_KVDL_PARTS_INFO_LEN ARRAY_SIZE(mlxsw_sp2_kvdl_parts_info)
struct mlxsw_sp2_kvdl_part {
const struct mlxsw_sp2_kvdl_part_info *info;
unsigned int usage_bit_count;
unsigned int indexes_per_usage_bit;
unsigned int last_allocated_bit;
unsigned long usage[0]; /* Usage bits */
};
struct mlxsw_sp2_kvdl {
struct mlxsw_sp2_kvdl_part *parts[MLXSW_SP2_KVDL_PARTS_INFO_LEN];
};
static int mlxsw_sp2_kvdl_part_find_zero_bits(struct mlxsw_sp2_kvdl_part *part,
unsigned int bit_count,
unsigned int *p_bit)
{
unsigned int start_bit;
unsigned int bit;
unsigned int i;
bool wrap = false;
start_bit = part->last_allocated_bit + 1;
if (start_bit == part->usage_bit_count)
start_bit = 0;
bit = start_bit;
again:
bit = find_next_zero_bit(part->usage, part->usage_bit_count, bit);
if (!wrap && bit + bit_count >= part->usage_bit_count) {
wrap = true;
bit = 0;
goto again;
}
if (wrap && bit + bit_count >= start_bit)
return -ENOBUFS;
for (i = 0; i < bit_count; i++) {
if (test_bit(bit + i, part->usage)) {
bit += bit_count;
goto again;
}
}
*p_bit = bit;
return 0;
}
static int mlxsw_sp2_kvdl_part_alloc(struct mlxsw_sp2_kvdl_part *part,
unsigned int size,
u32 *p_kvdl_index)
{
unsigned int bit_count;
unsigned int bit;
unsigned int i;
int err;
bit_count = DIV_ROUND_UP(size, part->indexes_per_usage_bit);
err = mlxsw_sp2_kvdl_part_find_zero_bits(part, bit_count, &bit);
if (err)
return err;
for (i = 0; i < bit_count; i++)
__set_bit(bit + i, part->usage);
*p_kvdl_index = bit * part->indexes_per_usage_bit;
return 0;
}
static int mlxsw_sp2_kvdl_rec_del(struct mlxsw_sp *mlxsw_sp, u8 res_type,
u16 size, u32 kvdl_index)
{
char *iedr_pl;
int err;
iedr_pl = kmalloc(MLXSW_REG_IEDR_LEN, GFP_KERNEL);
if (!iedr_pl)
return -ENOMEM;
mlxsw_reg_iedr_pack(iedr_pl);
mlxsw_reg_iedr_rec_pack(iedr_pl, 0, res_type, size, kvdl_index);
err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(iedr), iedr_pl);
kfree(iedr_pl);
return err;
}
static void mlxsw_sp2_kvdl_part_free(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp2_kvdl_part *part,
unsigned int size, u32 kvdl_index)
{
unsigned int bit_count;
unsigned int bit;
unsigned int i;
int err;
/* We need to ask FW to delete previously used KVD linear index */
err = mlxsw_sp2_kvdl_rec_del(mlxsw_sp, part->info->res_type,
size, kvdl_index);
if (err)
return;
bit_count = DIV_ROUND_UP(size, part->indexes_per_usage_bit);
bit = kvdl_index / part->indexes_per_usage_bit;
for (i = 0; i < bit_count; i++)
__clear_bit(bit + i, part->usage);
}
static int mlxsw_sp2_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count,
u32 *p_entry_index)
{
unsigned int size = entry_count * mlxsw_sp_kvdl_entry_size(type);
struct mlxsw_sp2_kvdl *kvdl = priv;
struct mlxsw_sp2_kvdl_part *part = kvdl->parts[type];
return mlxsw_sp2_kvdl_part_alloc(part, size, p_entry_index);
}
static void mlxsw_sp2_kvdl_free(struct mlxsw_sp *mlxsw_sp, void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count,
int entry_index)
{
unsigned int size = entry_count * mlxsw_sp_kvdl_entry_size(type);
struct mlxsw_sp2_kvdl *kvdl = priv;
struct mlxsw_sp2_kvdl_part *part = kvdl->parts[type];
return mlxsw_sp2_kvdl_part_free(mlxsw_sp, part, size, entry_index);
}
static int mlxsw_sp2_kvdl_alloc_size_query(struct mlxsw_sp *mlxsw_sp,
void *priv,
enum mlxsw_sp_kvdl_entry_type type,
unsigned int entry_count,
unsigned int *p_alloc_count)
{
*p_alloc_count = entry_count;
return 0;
}
static struct mlxsw_sp2_kvdl_part *
mlxsw_sp2_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
const struct mlxsw_sp2_kvdl_part_info *info)
{
unsigned int indexes_per_usage_bit;
struct mlxsw_sp2_kvdl_part *part;
unsigned int index_range;
unsigned int usage_bit_count;
size_t usage_size;
if (!mlxsw_core_res_valid(mlxsw_sp->core,
info->usage_bit_count_res_id) ||
!mlxsw_core_res_valid(mlxsw_sp->core,
info->index_range_res_id))
return ERR_PTR(-EIO);
usage_bit_count = mlxsw_core_res_get(mlxsw_sp->core,
info->usage_bit_count_res_id);
index_range = mlxsw_core_res_get(mlxsw_sp->core,
info->index_range_res_id);
/* For some partitions, one usage bit represents a group of indexes.
* That's why we compute the number of indexes per usage bit here,
* according to queried resources.
*/
indexes_per_usage_bit = index_range / usage_bit_count;
usage_size = BITS_TO_LONGS(usage_bit_count) * sizeof(unsigned long);
part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
if (!part)
return ERR_PTR(-ENOMEM);
part->info = info;
part->usage_bit_count = usage_bit_count;
part->indexes_per_usage_bit = indexes_per_usage_bit;
part->last_allocated_bit = usage_bit_count - 1;
return part;
}
static void mlxsw_sp2_kvdl_part_fini(struct mlxsw_sp2_kvdl_part *part)
{
kfree(part);
}
static int mlxsw_sp2_kvdl_parts_init(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp2_kvdl *kvdl)
{
const struct mlxsw_sp2_kvdl_part_info *info;
int i;
int err;
for (i = 0; i < MLXSW_SP2_KVDL_PARTS_INFO_LEN; i++) {
info = &mlxsw_sp2_kvdl_parts_info[i];
kvdl->parts[i] = mlxsw_sp2_kvdl_part_init(mlxsw_sp, info);
if (IS_ERR(kvdl->parts[i])) {
err = PTR_ERR(kvdl->parts[i]);
goto err_kvdl_part_init;
}
}
return 0;
err_kvdl_part_init:
for (i--; i >= 0; i--)
mlxsw_sp2_kvdl_part_fini(kvdl->parts[i]);
return err;
}
static void mlxsw_sp2_kvdl_parts_fini(struct mlxsw_sp2_kvdl *kvdl)
{
int i;
for (i = 0; i < MLXSW_SP2_KVDL_PARTS_INFO_LEN; i++)
mlxsw_sp2_kvdl_part_fini(kvdl->parts[i]);
}
static int mlxsw_sp2_kvdl_init(struct mlxsw_sp *mlxsw_sp, void *priv)
{
struct mlxsw_sp2_kvdl *kvdl = priv;
return mlxsw_sp2_kvdl_parts_init(mlxsw_sp, kvdl);
}
static void mlxsw_sp2_kvdl_fini(struct mlxsw_sp *mlxsw_sp, void *priv)
{
struct mlxsw_sp2_kvdl *kvdl = priv;
mlxsw_sp2_kvdl_parts_fini(kvdl);
}
const struct mlxsw_sp_kvdl_ops mlxsw_sp2_kvdl_ops = {
.priv_size = sizeof(struct mlxsw_sp2_kvdl),
.init = mlxsw_sp2_kvdl_init,
.fini = mlxsw_sp2_kvdl_fini,
.alloc = mlxsw_sp2_kvdl_alloc,
.free = mlxsw_sp2_kvdl_free,
.alloc_size_query = mlxsw_sp2_kvdl_alloc_size_query,
};
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